Oscillator, Electronic Apparatus, and Moving Object

ABSTRACT

An oscillator comprising a support substrate, at least one transducer mounted on a first surface of the support substrate, and an integrated circuit element mounted on a second surface of the support substrate. The integrated circuit element includes first and second frequency generating components integrated therein. The first frequency generating component generates a first output frequency, and the second frequency generating component generates a second output frequency that is higher than the first output frequency. The oscillator also includes a ground terminal to which the second frequency generating component is closer than the first frequency generating component.

CONTINUATION DATA

This application is a continuation of, and claims priority under 35U.S.C. §120 on, application Ser. No. 14/848,772, filed Sep. 9, 2015,which claims priority to Japanese Patent Application No. 2014-194171,filed Sep. 24, 2014. Each such priority application is hereby expresslyincorporated by reference herein in its entirety.

BACKGROUND

1. Technical Field

The present invention relates to an oscillator, an electronic apparatus,and a moving object.

2. Related Art

The reference frequencies used for backbone lines such as a synchronousoptical network (SONET) and a synchronous digital hierarchy (SDH) arerequired to correspond to different frequencies from each other. Forthis purpose, equipment related to a transmission device used forbackbone lines is provided with a plurality of oscillators capable ofrespectively oscillating frequency signals different from each other,and is configured to select a certain oscillators to output a desiredfrequency signal, by a selection signal or the like from the outside.

For example, JP-A-2005-6130 discloses a two-frequency switching-typehigh-frequency quartz crystal oscillator including a first quartzcrystal oscillation unit that outputs a first frequency signal, a secondquartz crystal oscillation unit that outputs a second frequency signal,a first switch for supplying power to any one of the first quartzcrystal oscillation unit and the second quartz crystal oscillation unit,by a selection signal from the outside, and a second switch that selectsany one of the outputs of the first quartz crystal oscillation unit andthe second quartz crystal oscillation unit, by a selection signal fromthe outside.

In this two-frequency switching-type high-frequency quartz crystaloscillator, the frequencies of the frequency signals which are outputfrom the first quartz crystal oscillation unit and the second quartzcrystal oscillation unit are adjusted, by controlling the capacitance ofthe variable-capacitance diode included in the first quartz crystaloscillation unit and the capacitance of the variable-capacitance diodeincluded in the second quartz crystal oscillation unit by a frequencycontrol voltage.

Further, the first quartz crystal oscillation unit further includes aresistor, and the characteristics of the above-describedvariable-capacitance diode and the resistor are appropriately selected,depending on the output frequency that is obtained by the first quartzcrystal oscillation unit.

Similarly, the second quartz crystal oscillation unit also furtherincludes a resistor, and the characteristics of the above-describedvariable-capacitance diode and the resistor are appropriately selected,depending on the output frequency that is obtained by the second quartzcrystal oscillation unit.

In the two-frequency switching-type high-frequency quartz crystaloscillator of such a configuration, for example, as JP-A-2012-151773, itis conceivable to arrange both the first and second quartz crystaloscillation units on a single substrate.

However, if attempting to place (mount) two quartz crystal oscillationunits on a single substrate, as described above, while reducing the sizeof the oscillator itself, there is a need to place two quartz crystaloscillation units in a limited region on the substrate, such that thereis a limit to the degree of freedom in the design of the oscillator.

Therefore, there is a problem in that in particular, the outputfrequency of a quartz crystal oscillation unit (oscillator circuit) foroutputting an output frequency of a higher frequency is unstable,depending on positions where the two quartz crystal oscillation units(oscillator circuit) are placed.

SUMMARY

An advantage of some aspects of the invention is to provide anoscillator which is compact and in which the output frequencies arestable, and an electronic apparatus and a moving object, which areprovided with the oscillator.

The invention can be implemented in numerous ways including thefollowing forms.

An oscillator according to one aspect includes: a support substrate; atleast one transducer mounted on a first surface of the supportsubstrate; an integrated circuit element mounted on a second surface ofthe support substrate, the integrated circuit element including firstand second frequency generating components integrated therein, the firstfrequency generating component generating a first output frequency andthe second frequency generating component generating a second outputfrequency that is higher than the first output frequency; and a groundterminal. The second frequency generating component is closer than thefirst frequency generating component to the ground terminal.

With this configuration, since the second frequency generating componenthaving a higher output frequency is placed closer to the groundterminal, the second output frequency is stable, resulting instabilization of both the first and second output frequencies.

The first and second frequency generating components may comprise firstand second oscillator circuits respectively.

With this arrangement, the first oscillator circuit may include a firstmultiplier circuit, the second oscillator circuit may include a secondmultiplier circuit, and the second multiplier circuit is placed closerto the ground terminal than the first multiplier circuit. With thisconfiguration, it is possible to more reliably stabilize the secondoutput frequency.

In another arrangement, there are first and second transducers.Moreover, the first frequency generating component is a first oscillatorcircuit that is electrically connected to the first transducer, and thesecond frequency generating component is a second oscillator circuitthat is electrically connected to the second transducer.

In another arrangement, the ground terminal connects the integratedcircuit element to the second surface of the support substrate.

In another arrangement, the one or more transducers at least partiallyoverlap the integrated circuit in plan view.

In another arrangement, there is a terminal for outputting any one ofthe first output frequency and the second output frequency, and thefirst and second frequency generating components are placed at aposition between the ground terminal and the output terminal on thesubstrate in plan view.

In another aspect, it is preferable that the second output frequency is800 MHz or more.

When the second output frequency is such a high frequency, it ispossible to more reliably stabilize the second output frequency.

An electronic apparatus according to another aspect includes theoscillator described above.

With this configuration, a highly reliable electronic apparatus isobtained.

A moving object according to another aspect includes the oscillatordescribed above.

With this configuration, a highly reliable moving object is obtained.

BRIEF DESCRIPTION OF THE DRAWINGS

The invention will be described with reference to the accompanyingdrawings, wherein like numbers reference like elements.

FIG. 1 is a block diagram illustrating an oscillator circuit provided inan embodiment of an oscillator according to the invention.

FIG. 2 is a perspective view illustrating an appearance of an oscillator(an embodiment of an oscillator according to the invention) includingthe oscillator circuit illustrated in FIG. 1.

FIG. 3 is an A-A line longitudinal sectional view of the oscillatorillustrated in FIG. 2.

FIG. 4 is a partially exploded perspective view of the oscillatorillustrated in FIG. 2.

FIG. 5 is a partially exploded perspective view of the oscillatorillustrated in FIG. 2.

FIG. 6 is a longitudinal sectional view illustrating anotherconfiguration example of the embodiment of the oscillator according tothe invention.

FIG. 7 is a perspective view illustrating a configuration of a mobiletype (or a notebook type) personal computer which is a first example ofan electronic apparatus according to the invention.

FIG. 8 is a perspective view illustrating a configuration of a mobilephone (including a PHS) which is a second example of the electronicdevice according to the invention.

FIG. 9 is a perspective view illustrating a configuration of a digitalstill camera which is a third example of the electronic device accordingto the invention.

FIG. 10 is a schematic diagram of a network including an opticaltransmission apparatus according to a fourth example of the electronicapparatus according to the invention.

FIG. 11 is a perspective view illustrating a configuration of a vehiclewhich is an example of a moving object according to the invention.

DESCRIPTION OF EXEMPLARY EMBODIMENTS

Hereinafter, an oscillator, an electronic apparatus, and a moving objectaccording to the invention will be described in detail based onembodiments illustrated in the accompanying drawings.

1. Oscillator Circuit

First, an oscillator circuit provided in an embodiment of an oscillatoraccording to the invention will be described.

FIG. 1 is a block diagram illustrating an oscillator circuit provided inthe embodiment of the oscillator according to the invention.

The oscillator circuit 1 illustrated in FIG. 1 is an example in whichtwo voltage-controlled oscillator circuits (VCXO) are provided in asingle substrate. The oscillator circuit 1 illustrated in FIG. 1includes a first VCXO (a first oscillator circuit) 7 that outputs adesired first frequency signal (a first output frequency) by a controlvoltage applied from the outside, a second VCXO (a second oscillatorcircuit) 8 that outputs a desired second frequency signal (a secondoutput frequency) by a control voltage applied from the outside, and aselection unit 9 that selects the output of the first VCXO 7 and thesecond VCXO 8.

In addition, the selection unit 9 includes a power switching circuit 10for applying (supplying) a power supply voltage to any one of the firstVCXO 7 and the second VCXO 8 by a selection signal applied from theoutside, an output switching circuit 11 that selects the output of anyone of the first VCXO 7 and the second VCXO 8 by a selection signalapplied from the outside, and an amplifier 12 that amplifies theselected frequency signal to a predetermined level.

Further, the oscillator circuit 1 includes a control voltage terminal 61for applying a control voltage to the first VCXO 7 and the second VCXO8, a power supply terminal 62 that applies a power supply voltage to thepower switching circuit 10, an oscillator output terminal (terminal foroutput) 63 that outputs a frequency signal amplified by the amplifier 12to the outside, a selection signal terminal 64 for inputting a selectionsignal to the selection unit 9, and a ground terminal (terminal foroutput) 65 which is electrically grounded.

Hereinafter, the configuration of each part of the oscillator circuit 1will be described in more detail. In addition, the configurationdescribed below is an example of the configuration of the oscillatorcircuit included in the oscillator according to the invention, and theinvention is not limited thereto.

The first VCXO 7 illustrated in FIG. 1 includes a so-called Colpittsoscillation circuit.

Specifically, the first VCXO 7 first includes a resistor R11 (a firstresistor), a variable-capacitance diode D11 (a firstvariable-capacitance diode), a capacitor C11, an expansion coil L11, anda resonator X11 (oscillation unit). The control voltage is input to oneend of the resistor R11 from the outside. Further, the other end ofresistor R11 is connected to the cathode side of thevariable-capacitance diode D11 and one end of the capacitor C11.Further, the other end of the capacitor C11 is connected to one end ofthe expansion coil L11, and the other end of the expansion coil L11 isconnected to one end of the resonator X11.

In addition, the first VCXO 7 further includes a transistor Q11, aresistor R12, a resistor R13, a resistor R14, a capacitor C12, acapacitor C13, a capacitor C14, and a coil L12. The base of thetransistor Q11, one end of the resistor R12, and one end of the resistorR13 are connected to the other end of the resonator X11. These resistorR12 and resistor R13 function as a base bias resistor. Then, the otherend of the resistor R13 is grounded. Further, the capacitor C12 and thecapacitor C13 which have some of the load capacitance are inserted in astate of being connected in series, to between the base of thetransistor Q11 and the ground. Then, the connection point between thecapacitor C12 and the capacitor C13 and the emitter of the transistorQ11 are connected, and the resistor R14 is inserted as an emitterresistor between the emitter of the transistor Q11 and the ground.Further, the coil L12 and the capacitor C14 are connected in parallelbetween the collector of the transistor Q11 and the power switchingcircuit 10. A tuning circuit (multiplier circuit) 124 that can be tunedto the harmonic frequency (higher-order wave) of a desired order numberof the resonator X11 is configured, and a C tap is configured.

In addition, the first VCXO 7 further includes a capacitor C15, acapacitor C16, a resistor R15, a resistor R16, and a resistor R17. Thecoil L12 and the capacitor C14 on the power switching circuit 10 sideare respectively grounded through the capacitor C16. Meanwhile, one endof the capacitor C15 is connected to the collector side of the coil L12and capacitor C14. The other end of the capacitor C15 is connected tothe output switching circuit 11 through an attenuator constituted by theresistor R15, the resistor R16, and the resistor R17. In other words,the output terminal 71 (first output terminal) that outputs a frequencysignal from the first VCXO 7 is electrically connected to the outputswitching circuit 11 that is shared with the second VCXO 8, which willbe described later. Although the attenuator illustrated in FIG. 1 is aso-called π-type unbalanced attenuator, as long as impedance matchingand the output level are possible, the configuration of the attenuatoris not limited thereto.

Such a first VCXO 7 performs signal amplification and waveform shapingsuch that the resonator X11 in the oscillation circuit continues theoscillation operation, while controlling the oscillation frequency ofthe resonator X11, depending on the control voltage applied from theoutside. Thus, a first frequency signal of a desired frequency (firstoutput frequency) is output from the first VCXO 7.

Meanwhile, the second VCXO 8 illustrated in FIG. 1 also includes anoscillation circuit having the same configuration as in the first VCXO7.

Specifically, the second VCXO 8 first includes a resistor R21 (a secondresistor), a variable-capacitance diode D21 (a secondvariable-capacitance diode), a capacitor C21, an expansion coil L21, anda resonator X21. The control voltage is input to one end of the resistorR21 from the outside. Further, the other end of resistor R21 isconnected to the cathode side of the variable-capacitance diode D21 andone end of the capacitor C21. Further, the other end of the capacitorC21 is connected to one end of the expansion coil L21, and the other endof the expansion coil L21 is connected to one end of the resonator X21.

In addition, the second VCXO 8 further includes a transistor Q21, aresistor R22, a resistor R23, a resistor R24, a capacitor C22, acapacitor C23, a capacitor C24, and a coil L22. The base of thetransistor Q21, one end of the resistor R22, and one end of the resistorR23 are connected to the other end of the resonator X21. These resistorR22 and resistor R23 function as a base bias resistor. Then, the otherend of the resistor R23 is grounded. Further, the capacitor C22 and thecapacitor C23 which have some of the load capacitance are inserted in astate of being connected in series, to between the base of thetransistor Q21 and the ground. Then, the connection point between thecapacitor C22 and the capacitor C23 and the emitter of the transistorQ21 are connected, and the resistor R24 is inserted as an emitterresistor between the emitter of the transistor Q21 and the ground.Further, the coil L22 and the capacitor C24 are connected in parallelbetween the collector of the transistor Q21 and the power switchingcircuit 10. A tuning circuit (multiplier circuit) 224 that can be tunedto the harmonic frequency (higher-order wave) of a desired order numberof the resonator X21 is configured, and a C tap is configured.

In addition, the second VCXO 8 further includes a capacitor C25, acapacitor C26, a resistor R25, a resistor R26, and a resistor R27. Thecoil L22 and the capacitor C24 on the power switching circuit 10 sideare respectively grounded through the capacitor C26. Meanwhile, one endof the capacitor C25 is connected to the collector side of the coil L22and capacitor C24. The other end of the capacitor C25 is connected tothe output switching circuit 11 through an attenuator constituted by theresistor R25, the resistor R26, and the resistor R27. In other words,the output terminal 81 (second output terminal) that outputs a frequencysignal from the second VCXO 8 is electrically connected to the outputswitching circuit 11 that is shared with the first VCXO 7, which will bedescribed later. Although the attenuator illustrated in FIG. 1 is aso-called π-type unbalanced attenuator, as long as impedance matchingand the output level are possible, the configuration of the attenuatoris not limited thereto.

Such a second VCXO 8 performs signal amplification and waveform shapingsuch that the resonator X21 in the oscillation circuit continues theoscillation operation, while controlling the oscillation frequency ofthe resonator X21, depending on the control voltage applied from theoutside. Thus, a second frequency signal of a desired frequency (secondoutput frequency) is output from the second VCXO 8.

Further, the first VCXO 7 and the second VCXO 8 are respectivelyprovided with resonators having a fundamental frequency of, for example,150 MHz band. Then, the resonator X11 provided in the first VCXO 7 andthe resonator X21 provided in the second VCXO 8 have fundamentalfrequencies different from each other in the frequency band.

Then, the selection unit 9 operates the power switching circuit 10 andthe output switching circuit 11, by a selection signal applied from theoutside. This enables one of the first VCXO 7 and the second VCXO 8 tobe selected and operated. For example, when the first VCXO 7 is selectedby switching the conduction path of the power switching circuit 10 andthe conduction path of the output switching circuit 11, the power supplyvoltage is applied only to the first VCXO 7, the output terminal 71 andthe oscillator output terminal 63 are connected, and only a frequencysignal is input from the first VCXO 7 to the amplifier 12, and is outputas the first frequency signal after being amplified to a predeterminedlevel. When the second VCXO 8 is selected by switching the powerswitching circuit 10 and the output switching circuit 11, the powersupply voltage is applied only to the second VCXO 8, the output terminal81 and the oscillator output terminal 63 are connected, and only afrequency signal is input from the second VCXO 8 to the amplifier 12,and is output as the second frequency signal after being amplified to apredetermined level.

Since the power switching circuit 10 is provided in this way and it ispossible to apply a power supply voltage to one that corresponds to theoutput frequency of interest, among the first VCXO 7 and the second VCXO8, power consumption is intended to be reduced and the occurrence ofelectromagnetic interference waves due to energization can besuppressed.

In the invention, the second output frequency of the second frequencysignal output from the second VCXO 8 is higher than the first outputfrequency of the first frequency signal output from the first VCXO 7.

In addition, it is possible to match the frequency tuned by each tuningcircuit to a desired value (for example, the fundamental frequency ofthe resonator, or its integer multiple), by appropriately setting thetuning circuits included in the first VCXO 7 and the second VCXO 8.

For example, when the fundamental frequency of the resonator X11provided in the first VCXO 7 is 155 MHz, it is possible to output thefrequency signal of 155 MHz as the first frequency signal or to outputthe frequency signal of 622 MHz or 778 MHz that is a fourth harmonic ora fifth harmonic of the fundamental frequency as the first frequencysignal, by the setting of the tuning circuit.

For example, when the fundamental frequency of the resonator X21provided in the second VCXO 8 is 161 MHz, it is possible to output thefrequency signal of 161 MHz as the second frequency signal or to outputthe frequency signal of 644 MHz or 805 MHz that is a fourth harmonic ora fifth harmonic of the fundamental frequency as the second frequencysignal, by the setting of the tuning circuit.

In general, the tuning frequency f of the tuning circuit is obtained bythe inductance L of the coil and the capacitance C of the capacitorconstituting a parallel resonance circuit as follows:[f=1/{2π(LC)^(1/2)}]. Therefore, the coil and capacitor of the tuningcircuit (parallel resonance circuit) may be appropriately selected inorder to match the frequency tuned in the tuning circuit to a desiredvalue.

In addition, in the present embodiment, the amplifier 12 is insertedbetween the output switching circuit 11 and the oscillator outputterminal 63. Therefore, the amplifier 12 is shared by the first VCXO 7and the second VCXO 8. Therefore, as compared with the case whereamplifiers are separately provided, it is possible to reduce the numberof amplifiers 12, and the oscillator circuit 1 can be miniaturized. Sucha configuration is particularly useful, for example, when the usedfrequencies are close to each other, as a clock signal used in aSONET/SDH network or the like.

Meanwhile, if the amplifier 12 is not shared by the first VCXO 7 and thesecond VCXO 8, the oscillator circuit 1 may include, for example, anamplifier for the first VCXO 7 and an amplifier for the second VCXO 8.

In addition, the first VCXO 7 and the second VCXO 8 each may include afilter that removes unwanted frequency components from the frequencysignal which is output therefrom. Examples of such a filter include asurface acoustic wave (SAW) filter, and the like.

Further, the oscillator circuit 1 may include any discrete components,integrated circuit components and the like, in addition to theillustrated configuration.

The oscillator circuit 1 may further include one or morevoltage-controlled oscillator circuits (VCXO) equivalent to the firstVCXO 7 and the second VCXO 8. In other words, the oscillator circuit 1may further include three or more VCXOs. In this case, the added VCXOsmay be connected to the power switching circuit 10 and the outputswitching circuit 11.

Further, as the resonator X11 and the resonator X21, for example,various resonators such as an AT-cut quartz crystal resonator, a tuningfork type quartz crystal resonator, a surface acoustic wave resonatorare used. The quartz crystal resonator is preferably used among them,from the viewpoint of obtaining a fundamental frequency with highfrequency accuracy. Accordingly, an oscillator circuit 1 with highfrequency accuracy is obtained.

2. Oscillator

The embodiment of the oscillator according to the invention will bedescribed below.

FIG. 2 is a perspective view illustrating an appearance of an oscillator(an embodiment of an oscillator according to the invention) includingthe oscillator circuit illustrated in FIG. 1, FIG. 3 is an A-A linelongitudinal sectional view of the oscillator illustrated in FIG. 2,FIG. 4 is a partially exploded perspective view of the oscillatorillustrated in FIG. 2, FIG. 5 is a partially exploded perspective viewof the oscillator illustrated in FIG. 2. For convenience of description,the lid provided in the oscillator is omitted in FIG. 4, and in FIG. 5,the oscillator circuit board provided in the oscillator is viewed frombelow.

The oscillator 100 illustrated in FIGS. 2 to 5 includes a package 2, asupporting substrate 3 fixed in the package 2, and a circuit board 30including an oscillator circuit 1 mounted on the supporting substrate 3.

Among them, the package 2 includes a base substrate 21 provided with arecess 211, and a lid (cover) 27 which is provided with a recess 211 andbonded to the base substrate 21. In the package 2, an internal space Sis provided between the base substrate 21 and the lid 27, and thecircuit board 30 is accommodated in the internal space. Since theoscillator circuit 1 provided in the circuit board 30 is accommodated insuch a package 2, it is possible to protect the oscillator circuit 1fromexternal force and environmental change, thereby allowingimprovement in the reliability of the oscillator 100.

The base substrate 21, as illustrated in FIG. 3, has a box-shapeincluding a recess 211, of which the top surface opens. In other words,the base substrate 21 includes a plate-shaped bottom plate 212, and aframe-shaped side wall 213 that is erected from the edge of the uppersurface of the bottom plate 212.

Further, as illustrated in FIG. 4, six terminals 241, 242, 243, 244,245, and 246 are provided in the base substrate 21, and these terminals241 to 246 has both a function as an internal terminal to beelectrically connected to the terminal provided in the circuit board 30,and a function as an external terminal to be electrically connected tothe terminal provided in the mounting substrate (not shown) and the likeon which the oscillator 100 is mounted.

In addition, the constituent material of the insulation portions of thepackage 2 is obtained, by performing a sintering process on ceramicgreen sheets made of, for example, aluminum oxide, aluminum nitride,silicon carbide, mullite, and glass-ceramic.

Meanwhile, the constituent material of the conductive portions of thepackage 2 is obtained by coating, for example, an underlying layer oftungsten (W), molybdenum (Mo), or the like with a plating layer of gold(Au), copper (Cu), or the like.

The circuit board 30 includes a supporting substrate (base member) 3fixed in the package 2, and the oscillator circuit 1 mounted on thesupporting substrate 3.

In the supporting substrate (substrate) 3, its overall shape is a flatplate shape, and is configured with, for example, a low-temperatureco-fired ceramic substrate (LTCC substrate). As a result, a supportingsubstrate 3 of high strength can be obtained. Further, it is possible toform a wiring pattern at the same time, and reduce the manufacturingsteps of the oscillator 100. In addition, the supporting substrate 3 maybe a single-layer board or a multilayer board. Further, as thesupporting substrate 3, without being limited to the low-temperatureco-fired ceramic substrate, in addition thereto, for example, ceramicsubstrates other than the low-temperature co-fired ceramic substrate,resin substrates (printed circuit boards) made of a glass epoxy or othercomponents, or glass substrates may be used.

Further, respective three notches (a total of six) are provided side byside on the two side surfaces extending in the y-axis direction of thesupporting substrate 3, castellations having conductivity 321, 322, 323,324, 325, and 326 are formed corresponding to these notches, amongthese, the castellations 321, 322, 324, 325, and 326 respectivelyconstitute a power supply terminal 62, an oscillator output terminal(terminal for output) 63, a control voltage terminal 61, a selectionsignal terminal 64, and a ground terminal (terminal for ground) 65,which are included in the oscillator circuit 1.

As illustrated in FIG. 3, the supporting substrate 3 is arranged tooverlap the recess 211 in a plan view, the castellations 321, 322, 323,324, 325, and 326 and the terminals 241, 242, 243, 244, 245, and 246 arejoined through solder H, and thus the supporting substrate 3 is fixed tothe upper surface of the base substrate 21, and the castellations 321,322, 323, 324, 325, and 326 and the terminals 241, 242, 243, 244, 245,and 246 are electrically connected to each other. Further, a fixingmember for fixing the supporting substrate 3 to the base substrate 21 isnot limited to the solder, and it is possible to use a metal brazingmaterial such as gold braze or silver braze, a conductive adhesive, orthe like.

The oscillator circuit 1 of which configuration has been previouslydescribed with reference to FIG. 1 includes in the oscillator 100, asillustrated in FIGS. 3 to 5, wiring patterns (not shown) formed on theupper surface, a lower surface, and the interior of the supportingsubstrate 3, resonators X11, X21 and tuning circuits (multipliercircuit) 124, 224 which are mounted on the lower surface of thesupporting substrate 3, a plurality of circuit elements 59 mounted onthe upper surface of the supporting substrate 3, and castellations 321,322, 324, 325, 326 respectively constituting the power supply terminal62, the oscillator output terminal (terminal for output) 63, the controlvoltage terminal 61, the selection signal terminal 64, the groundterminal 65 (terminal for the ground) formed on the side surface of thesupporting substrate 3.

In addition, except for the resonators X11, X21, the tuning circuits124, 224, the power supply terminal 62, the oscillator output terminal63, the control voltage terminal 61, the selection signal terminal 64,and the ground terminal 65, respective components constituting theoscillator circuit 1 are mounted as a plurality of circuit elements 59.

In addition, the resonators X11, X21, the tuning circuits 124, 224, thepower supply terminal 62, the oscillator output terminal 63, the controlvoltage terminal 61, the selection signal terminal 64, the groundterminal 65, and the circuit elements 59 are electrically connected witheach other through wiring patterns, thereby the oscillator circuit 1 isformed.

As illustrated in FIG. 5, in the oscillator circuit 1 having such aconfiguration, in the supporting substrate 3, the power supply terminal62 and the oscillator output terminal 63 are provided side by side inthe y-axis direction, on the side surface on −x-axis direction sideextending along the y-axis direction, and the control voltage terminal61, the selection signal terminal 64, and the ground terminal 65 areprovided side by side in the y-axis direction, on the side surface on+x-axis direction side extending along the y-axis direction.

Further, the resonator X11 and the tuning circuit 124 are arranged onthe lower surface of the supporting substrate 3, side by side in thisorder in the +y-axis direction, and mounted on the −x-axis directionside, and the resonator X21 and the tuning circuit 224 are arranged onthe lower surface of the supporting substrate 3, side by side in thisorder in the +y-axis direction, and mounted on the +x-axis directionside, such that the first VCXO 7 is located on the −x-axis directionside of the lower surface of the supporting substrate 3, and the secondVCXO 8 is located on the +x-axis direction side of the lower surface ofthe substrate 3.

Here, as described above, although the second output frequency of thesecond frequency signal output from the second VCXO 8 is higher than thefirst output frequency of the first frequency signal output from thefirst VCXO 7, respective components constituting the oscillator circuit1 in the supporting substrate 3 have the positional relationship asdescribed above, such that the second VCXO 8 outputting the secondoutput frequency is located closer to the ground terminal 65 than thefirst VCXO7 outputting the first output frequency.

It has been found through the study by the inventors of the inventionthat if the positional relationship between the second VCXO 8 and thefirst VCXO 7 satisfies the positional relationship as described above,the second output frequency (higher than the first output frequency)that is output from the second oscillator circuit is stabilized.

Therefore, since the oscillator is designed to satisfy such arelationship, even if there is a limit to a degree of freedom of designof the oscillator 100, it is possible to stabilize both the first outputfrequency and the second output frequency which are output from thefirst VCXO 7 and the second VCXO 8.

Further, in the present embodiment, as illustrated in FIG. 5, amongrespective components constituting the second VCXO 8 and the first VCXO7, the tuning circuit 124 and the tuning circuit 224 are mounted closerto the ground terminal 65, and among these, the tuning circuit 224 isdisposed closer to the ground terminal 65 than the tuning circuit 124.Thus, it is possible to more reliably stabilize the second outputfrequency that the second VCXO 8 outputs.

Further, as illustrated in FIG. 5, since the first VCXO 7 is located onthe −x-axis direction side of the lower surface of the supportingsubstrate 3, the second VCXO 8 is located on the +x-axis direction sideof the lower surface of the supporting substrate 3, the ground terminal65 is provided on the side surface on +x-axis direction side extendingalong the y-axis direction, and the oscillator output terminal 63 isprovided on the side surface on −x-axis direction side extending alongthe y-axis direction, the first of VCXO 7 and the second VCXO 8 arearranged at a position between the ground terminal 65 and the oscillatoroutput terminal 63. By such a configuration, it is possible to reliablystabilize the second output frequency that the second VCXO8 outputs.

Although the second output frequency that is output from the second VCXO8 may be higher than the first output frequency that the first VCXO 7outputs, specifically, is preferably not less than 800 MHz. When thesecond output frequency is such a high frequency, it is possible tostabilize the second output frequency more reliably by arranging thesecond VCXO 8 closer to the ground terminal 65.

Then, another configuration example of an embodiment of the oscillatoraccording to the invention will be described.

FIG. 6 is a longitudinal sectional view illustrating anotherconfiguration example of the embodiment of the oscillator according tothe invention.

The oscillator 100 illustrated in FIG. 6 includes a package 2, asupporting substrate 3 fixed in the package 2, and an oscillator circuit1 mounted on the supporting substrate 3. In the following description,the upper part in FIG. 6 is referred to as “up”, and the lower partthereof is referred to as “down”.

In the oscillator 100 illustrated in FIG. 6, the resonator X11 includedin the first VCXO 7 and the resonator X21 included in the second VCXO 8are mounted on the upper surface of the supporting substrate 3 in theoscillator circuit 1. Meanwhile, at least a portion of the resistor, thevariable-capacitance diode, the capacitor, and the transistorconstituting respective components including the tuning circuit 124,except for the resonator X11, which are included in the first VCXO 7 andthe resistor, the variable-capacitance diode, the capacitor, and thetransistor constituting respective components including the tuningcircuit 224, except for the resonator X21, which are included in thesecond VCXO 8 in the oscillator circuit 1 are integrated into anintegrated circuit element 4, and the integrated circuit element 4 ismounted on the lower surface of the supporting substrate 3 through aplurality of terminals 41 included in the integrated circuit element 4.In the oscillator 100 illustrated in FIG. 6 of the above configuration,in the integrated circuit element 4, a plurality of terminals 41constitute the power supply terminal 62, the oscillator output terminal63, the control voltage terminal 61, the selection signal terminals 64,and the ground terminals 65, the tuning circuit 224 is located closer tothe ground terminal 65 among these as compared with the tuning circuit124, and thus the second output frequency that is output from the secondVCXO 8 is stabilized.

Further, external connection terminals 251 and 252 are provided on thelower surface of the package 2.

According to the oscillator 100, it is possible to reduce the number ofdiscrete components constituting the oscillator circuit 1, such thatminiaturization is achieved and manufacturability is improved.

3. Electronic Apparatus

Next, electronic apparatuses having the oscillator according to theinvention (the electronic apparatus according to the invention) will bedescribed in detail, based on FIG. 7 to FIG. 10.

FIG. 7 is a perspective view illustrating a configuration of a mobiletype (or a notebook type) personal computer which is a first example ofthe electronic apparatus according to the invention. In this FIG. 7, apersonal computer 1100 includes a main body 1104 having a keyboard 1102,and a display unit 1106 having a display 2000. The display unit 1106 isrotatably supported with respect to the main body 1104 through a hingestructure. Such a personal computer 1100 includes the built-inoscillator 100.

FIG. 8 is a perspective view illustrating a configuration of a mobilephone (including a PHS) which is a second example of the electronicdevice according to the invention. In this FIG. 8, a mobile phone 1200includes a plurality of operation buttons 1202, an earpiece 1204, and amouthpiece 1206, and a display portion 2000 is disposed between theoperation buttons 1202 and the earpiece 1204. Such a mobile phone 1200includes the built-in oscillator 100.

FIG. 9 is a perspective view illustrating a configuration of a digitalstill camera which is a third example of the electronic device accordingto the invention. In addition, in this FIG. 9, the connection with anexternal device is illustrated in a simplified manner. Whereas in ageneral camera, a silver salt film is exposed to the optical image of anobject, a digital still camera 1300 photoelectrically converts anoptical image of an object by an image pickup device such as a chargecoupled device (CCD) and generates an imaging signal (video signal).

A display unit 2000 is provided on the back surface of the case (body)1302 which the digital still camera 1300 has therein, and is configuredto perform display based on the imaging signal by the CCD, and thedisplay unit 2000 functions as a viewfinder that displays the object asan electronic image. Further, a light receiving unit 1304 including anoptical lens (an imaging optical system) and a CCD are provided on thefront surface of the case 1302 (the back side in FIG. 9).

If a photographer confirms an object image displayed on the display2000, and presses a shutter button 1306, the imaging signal of the CCDat that time is transferred to and stored in the memory 1308. Further,in the digital still camera 1300, a video signal output terminal 1312and an input output terminal 1314 for data communication are provided inthe side surface of the case 1302. As illustrated in FIG. 9, a TVmonitor 1430 and a personal computer 1440 are respectively connected asrequired to the video signal output terminal 1312 and the input outputterminal 1314 for data communication. Further, it is configured that theimaging signal stored in the memory 1308 is output to the televisionmonitor 1430 or the personal computer 1440 by a predetermined operation.Such a digital still camera 1300 includes the built-in oscillator 100.

FIG. 10 is a schematic diagram of a network including an opticaltransmission apparatus according to a fourth example of the electronicapparatus according to the invention. In this FIG. 10, an opticaltransmission apparatus 1600 is arranged at a boundary between aSONET/SDH network and a wavelength division multiplexing (WDM) network,and converts a client signal transmitted to the SONET/SDH network and anOTUk (k=2, 3) signal transmitted through the WDM network to each other.In the example of FIG. 10, examples of the client signal include anOC3/STM-1 signal, an OC12/STM-4 signal, an OC48/STM-16 signal, and anOC192/STM-64 signal.

Such an optical transmission apparatus 1600 includes a clock generatorthat generates a clock corresponding to the client signal, and theoscillator 100 is built into the clock generator. The clock generatingunit is adapted to output clocks having different frequencies dependingon client signals having different transmission bit rates. In such acase, it is possible to easily output clocks of different frequencies byproviding the two-frequency switching type oscillator 100.

Further, in addition to the personal computer (mobile personal computer)in FIG. 7, the mobile phone in FIG. 8, the digital still camera in FIG.9, and the optical transmission apparatus in FIG. 10, the electronicapparatus including the oscillator according to the invention isapplicable to ink-jet type discharge devices (for example, ink jetprinters), laptop personal computers, TVs, video cameras, videorecorders, car navigation devices, pagers, electronic notebooks (havingcommunication functions), electronic dictionaries, calculators,electronic game machines, word processors, workstations, TV phones,security television monitors, electronic binoculars, POS terminals,medical equipment (for example, electronic thermometers, blood pressuremeters, blood glucose meters, electrocardiogram measurement apparatuses,ultrasonic diagnostic equipment, electronic endoscopes), fish finders,various types of measurement equipment, instruments (for example,vehicles, aircrafts, ship gauges), flight simulators or the like.

4. Moving Object

FIG. 11 is a perspective view illustrating a configuration of a vehiclewhich is an example of a moving object according to the invention.

In FIG. 11, a moving object 1500 includes a body 1501, and four wheels1502, and is configured to rotate the wheels 1502 through a power source(an engine) provided in the vehicle body 1501. Such a moving object 1500includes the built-in oscillator 100.

In addition, the moving object according to the invention is not limitedto a vehicle, and is applicable to, for example, various moving objectssuch as aircrafts, ships, and motorcycles.

Hitherto, the oscillator, the electronic apparatus, and the movingobject according to the invention have been described based on therespective embodiments, but the invention is not limited thereto, andthe configuration of each part can be replaced with any configurationhaving a similar function. Further, other arbitrary components may beadded.

The entire disclosure of Japanese Patent Application No. 2014-194171,filed Sep. 24, 2014 is expressly incorporated by reference herein.

What is claimed is:
 1. An oscillator comprising: a support substrate; atleast one transducer mounted on a first surface of the supportsubstrate; an integrated circuit element mounted on a second surface ofthe support substrate, the integrated circuit element including firstand second frequency generating components integrated therein, the firstfrequency generating component generating a first output frequency andthe second frequency generating component generating a second outputfrequency that is higher than the first output frequency; and a groundterminal, wherein the second frequency generating component is closerthan the first frequency generating component to the ground terminal. 2.The oscillator according to claim 1, wherein the first and secondfrequency generating components comprise first and second oscillatorcircuits respectively.
 3. The oscillator according to claim 1, wherein:the at least one transducer includes a first transducer and a secondtransducer, the first frequency generating component is a firstoscillator circuit that is electrically connected to the firsttransducer, and the second frequency generating component is a secondoscillator circuit that is electrically connected to the secondtransducer.
 4. The oscillator according to claim 1, wherein the groundterminal connects the integrated circuit element to the second surfaceof the support substrate.
 5. The oscillator according to claim 1,wherein the at least one transducer and the integrated circuit elementoverlap at least partially in plan view.
 6. The oscillator according toclaim 3, wherein the first transducer and the second transducer at leastpartially overlap the integrated circuit element in plan view.
 7. Theoscillator according to claim 1, wherein the second output frequency is800 MHz or more.
 8. The oscillator according to claim 1, furthercomprising: a terminal for outputting any one of the first outputfrequency and the second output frequency, and wherein the first andsecond frequency generating components are placed at a position betweenthe ground terminal and the output terminal on the substrate in planview.
 9. An electronic apparatus comprising: the oscillator according toclaim
 1. 10. An electronic apparatus comprising: the oscillatoraccording to claim
 2. 11. An electronic apparatus comprising: theoscillator according to claim
 3. 12. An electronic apparatus comprising:the oscillator according to claim
 5. 13. A moving object comprising: theoscillator according to claim
 1. 14. A moving object comprising: theoscillator according to claim
 2. 15. A moving object comprising: theoscillator according to claim
 3. 16. A moving object comprising: theoscillator according to claim 5.